I currently use, via adapter, on Canon EOS dSLRs: Pentax 50mm, f1.4, wonderful lens http://www.dgrin.com/showthread.php?t=37003 http://dgrin.com/showthread.php?t=38398 Soligor 28mm, f2.8, OK quality, don't use much (no samples) Vivitar 105mm, f2.8, very nice lens, usable as macro lens…